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imx_serial: Generate interrupt on tx empty if enabled

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Generate an interrupt if the tx buffer is empty and the tx empty interrupt
is enabled. This fixes a problem seen when running a Linux image since
Linux commit 55c3cb1358e ("serial: imx: remove unneeded imx_transmit_buffer()
from imx_start_tx()"). Linux now waits for the tx empty interrupt before
starting to send data, causing transmit stalls until there is an interrupt
for another reason.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Peter Crosthwaite <crosthwaite.peter@gmail.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Guenter Roeck 2015-08-20 08:52:35 -07:00 committed by Michael Tokarev
parent 7af0fc994e
commit dc1442204a
1 changed files with 3 additions and 1 deletions
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4
hw/char/imx_serial.c
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@ -66,7 +66,9 @@ static void imx_update(IMXSerialState *s)
uint32_t flags;
flags = (s->usr1 & s->ucr1) & (USR1_TRDY|USR1_RRDY);
if (!(s->ucr1 & UCR1_TXMPTYEN)) {
if (s->ucr1 & UCR1_TXMPTYEN) {
flags |= (s->uts1 & UTS1_TXEMPTY);
} else {
flags &= ~USR1_TRDY;
}